A Study On Balancing Of Car’s Body-in-white(BIW) Mixed-model Production Line In Body Shop

The automobile industry has become thriving in our country since the 21 stcentury. The enterprises which are related with automobile industry are sufferingserious quality problems with the automobile quantity per capita increasing indomestic market day by day. So it’s more important to develop quality managementmethods in the enterprise in a reasonable and efficient way. In the process of assembly,it’s the most difficult to reduce and inhibit quality fluctuation for the quality control.Therefore, we have to make the quality fluctuation in a permitted range so that we canimprove product quality steadily. So how to reduce the quality fluctuation in theprocess of assembly has become the core content in the field of modern qualitymanagement study. The dissertation’s research background is the enterpriseassembling automobile decelerator and starts from the mechanism of the assemblyquality formation. And the study focuses on the formation of the key qualitycharacteristics instead of the size factors. At the same time, the study builds thecorrelation model between quality control points and quality properties, and monitorsthe key points in the process of assembly timely to find out where the problem is easilyby using the method of the optimized EWMA control char. So it can achieve real-timefinding and real-time modification to guarantee the product quality of the enterpriseand improve the market competitiveness of the enterprise. Specific content is asfollows:Firstly, the dissertation studies the related knowledge and theory of qualitymanagement, and the situation of the current development both in domestic andforeign fields in quality management is studied. On the basis of the EWMA controlchart theory, the dissertation makes optimization design according to the actualsituation of the enterprise; Secondly, based on the assembly technology process of theenterprise, the dissertation sets up the model of the assembly technology process chart,the quality control points and quality attribute, and finds out the quality transferringrelationship between the different processes. After that it finds the key qualitycharacteristics and then makes the real-time monitoring of the characteristic points;Finally, the dissertation tests the collected sample data by using the method ofmathematical statistics. The result shows that the EWMA control chart is effective tothe key quality characteristics of the products.